Source : Webster's Revised Unabridged Dictionary (1913)

Arbitral \Ar"bi*tral\, a. [L. arbitralis.]
   Of or relating to an arbiter or an arbitration. [R.]

Source : WordNet®

arbitral
     adj : relating to or resulting from arbitration; "the arbitral
           adjustment of the controversy"; "an arbitrational
           settlement" [syn: {arbitrational}]